Which of the following best explains why ethanol (CH CH OH) has a higher normal…
CHEMISTRY · Single correct · A Level · Chemistry · Bonding · Bonding
Problem
Which of the following best explains why ethanol (CH3CH2OH) has a higher normal boiling point than its constitutional isomer dimethyl ether (CH3OCH3)?
(a) Ethanol has a greater molar mass than dimethyl ether, leading to stronger dispersion forces.
(b) Ethanol molecules can form intermolecular hydrogen bonds, whereas dimethyl ether molecules cannot.
(c) Ethanol has a larger molecular surface area than dimethyl ether, enhancing London dispersion forces.
(d) Ethanol’s O–H bond is more polar than the C–O bond in dimethyl ether, so ethanol experiences stronger dipole–dipole attractions instead of hydrogen bonding.